Pavel Machek writes: > We put all but one cpu in tight loop in smp_pause, so that it can't > interfere. That's enough for STD, but not for STR. I have an SMP powermac here that does STR quite nicely. The best solution I found to dealing with the 2nd cpu is to use the hotplug cpu framework and offline the cpu before starting the process of going to sleep. (Offline means that the cpu is put into a deep sleep state with interrupts disabled.) Then, after wakeup is complete, the 2nd cpu is brought online again (by a soft reset). The point is that the hotplug cpu framework exists and works, and all that I had to do was provide the low-level routines to actually put the cpu into the deep sleep state, and to reinitialize it once it had been reset. Paul.
